Yeah. There are many powerful batteries on the market that aims to charge several mobile devices on a single charge. Power capacity grows over time at a fast rate giving us high rates of power that would make your devices last for longer. However, the main issue here would be the high-end hardware needed, to help run the full node while at the same time have the capacity to run other apps in the background. If manufacturers decide to take the path towards making the possibility of running a full node from within any single device, then anyone would run a full node thus making the cryptocurrency more decentralized than ever.

As 21 Inc released mining chips for smartphones, then I have no doubt that the possibility to run a full node from within any smartphone or tablet will become a reality. Another thing to consider would be mobile data costs, which would limit the ability to run a full node even further. Just my opinion.